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Chemistry 9th Class English Medium Online Test MCQs With Answers
Question # 1
The branch of science helps to understand chemcial product andprocess that reduce the use of hazadous substances.
Choose an answer
Green chemistry
Astrochemistry
Analytical chemistry
Physical Chemistry
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Question # 2
How much heat absorbed when NH3decomposed into N2 and H2?
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90.4 kJ/mol
92.4 kJ/mol
94.2 kJ/mol
95.2 kJ/mol
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Question # 3
How many elements are present in 1st period.
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1
2
8
18
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Question # 4
Empirical formula of Benzene is.
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CH2O
CH
C2H
CH2
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Question # 5
The mass of one molecule of water is.
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18 g
18 mg
18 kg
18 amu
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Question # 6
All chemical reaction involves.
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Enzymes
Catalyst
Energy changes
All of these
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Question # 7
Who use the word energy for the 1st time
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Rutherford
Bohr
Thomas Young
None of these
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Question # 8
Bond formation energy of one O-H bond is............
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488 kJ/mol
484 kJ/mol
486 kJ/mol
489 kJ/mol
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Question # 9
Which particle is present in differente number in the isotopes.
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Proton
Electron
Neutron
Both neutron and electron
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Question # 10
Ionic compund are good conductors electricity in
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Solution
Molten state
Solid state
both a and b
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Question # 11
Chlorine has two isotopes, both of which have
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Same mass Number
Same number of electrons
Same number of neurtons
Different number of protons
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Question # 12
The horizontal lines present in the priodic table are called.
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Groups
Periods
Both a and b
None of these
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Question # 13
What is the mass of AI in 204 g of aluminium oxide Al
2
O
3
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26 g
54 g
108 g
27 g
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